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服务端实现　　与上篇文章一样，先搭建一个示例工程，再分析源码！这里建立一个maven工程，向pom.xml中添加如下信息：1234567&amp;l">
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服务端实现　　与上篇文章一样，先搭建一个示例工程，再分析源码！这里建立一个maven工程，向pom.xml中添加如下信息：1234567&amp;l">
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服务端实现　　与上篇文章一样，先搭建一个示例工程，再分析源码！这里建立一个maven工程，向pom.xml中添加如下信息：1234567&amp;l">
  
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      RPC系列四之HttpInvoker源码分析
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        <h2 id="u7B80_u4ECB"><a href="#u7B80_u4ECB" class="headerlink" title="简介"></a>简介</h2><p>　　前面介绍了hessian的实现原理和与spring的集成方式。事实上，spring本身就为我们提供了一个基于http的RPC调用。与hessian一样，该实现也在spring-web的jar包中。此外，在该jar中还实现了jaxws，这里不再做介绍。</p>
<h2 id="u670D_u52A1_u7AEF_u5B9E_u73B0"><a href="#u670D_u52A1_u7AEF_u5B9E_u73B0" class="headerlink" title="服务端实现"></a>服务端实现</h2><p>　　与上篇文章一样，先搭建一个示例工程，再分析源码！这里建立一个maven工程，向pom.xml中添加如下信息：<br><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="title">dependencies</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="title">dependency</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="title">groupId</span>&gt;</span>org.springframework.boot<span class="tag">&lt;/<span class="title">groupId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="title">artifactId</span>&gt;</span>spring-boot-starter-web<span class="tag">&lt;/<span class="title">artifactId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="title">version</span>&gt;</span>1.2.4.RELEASE<span class="tag">&lt;/<span class="title">version</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="title">dependency</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="title">dependencies</span>&gt;</span></span><br></pre></td></tr></table></figure></p>
<p>　　服务接口与实现类与上一篇文章汇总介绍的一致，这里不再赘述。下面定义一个ServerConfig类和启动类，如下所示：<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br></pre></td><td class="code"><pre><span class="line"><span class="annotation">@Configuration</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">ServerConfig</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="annotation">@Bean</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> MyService <span class="title">myService</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> MySeriviceImpl();</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="annotation">@Bean</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> MyServiceServerInterceptor <span class="title">serverInterceptor</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> MyServiceServerInterceptor();</span><br><span class="line">    &#125;</span><br><span class="line">    </span><br><span class="line">    <span class="annotation">@Bean</span>(name = <span class="string">"/hello2"</span>)</span><br><span class="line">    <span class="function">HttpInvokerServiceExporter <span class="title">httpInvokerServiceExporter</span><span class="params">(MyService myService, MyServiceServerInterceptor serverInterceptor)</span></span>&#123;</span><br><span class="line">        HttpInvokerServiceExporter exporter = <span class="keyword">new</span> HttpInvokerServiceExporter();</span><br><span class="line">        exporter.setService(myService);</span><br><span class="line">        exporter.setServiceInterface(MyService.class);</span><br><span class="line">        exporter.setInterceptors(<span class="keyword">new</span> Object[]&#123;serverInterceptor&#125;);</span><br><span class="line">        <span class="keyword">return</span> exporter;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="annotation">@SpringBootApplication</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">HttpInvokerApplication</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">        SpringApplication springApplication = <span class="keyword">new</span> SpringApplication(HessianApplication.class);</span><br><span class="line">        springApplication.run(args);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>　　可以看出，服务端实现基本上与hessian的配置一致，只是将<strong>HessianServiceExporter</strong>改为了<strong>HttpInvokerServiceExporter</strong>。启动服务即可，此时服务的访问地址为：<a href="http://localhost:8080/hello2" target="_blank" rel="external">http://localhost:8080/hello2</a></p>
<h2 id="u5BA2_u6237_u7AEF_u5B9E_u73B0"><a href="#u5BA2_u6237_u7AEF_u5B9E_u73B0" class="headerlink" title="客户端实现"></a>客户端实现</h2><p>　　与spring+hessian一样，只需要定义一个ClientConfig和启动类SpringClient。<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br></pre></td><td class="code"><pre><span class="line"><span class="annotation">@Configuration</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">ClientConfig</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="annotation">@Bean</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> HttpInvokerProxyFactoryBean <span class="title">httpInvokerProxyFactoryBean</span><span class="params">()</span></span>&#123;</span><br><span class="line">        HttpInvokerProxyFactoryBean bean = <span class="keyword">new</span> HttpInvokerProxyFactoryBean();</span><br><span class="line">        bean.setServiceUrl(<span class="string">"http://localhost:8080/hello2"</span>);</span><br><span class="line">        bean.setServiceInterface(MyService.class);</span><br><span class="line">        <span class="keyword">return</span> bean;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="annotation">@SpringBootApplication</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">SpringClient</span> <span class="keyword">implements</span> <span class="title">CommandLineRunner</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="comment">//@Autowired</span></span><br><span class="line">    <span class="comment">//ApplicationContext applicationContext;</span></span><br><span class="line">    <span class="annotation">@Autowired</span></span><br><span class="line">    MyService service;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">        SpringApplication springApplication = <span class="keyword">new</span> SpringApplication(SpringClient.class);</span><br><span class="line">        <span class="comment">//springApplication.addListeners(new ApplicationContextAware());</span></span><br><span class="line">        springApplication.run(args);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="annotation">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">(String... args)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">        <span class="comment">/*MyService myService = applicationContext.getBean(MyService.class);*/</span></span><br><span class="line">        System.out.println(service.doSomething(<span class="string">"xixixixi"</span>));</span><br><span class="line">        System.out.println(<span class="string">"ok!"</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>　　可以看出，客户端实现基本上与hessian的配置一致，只是将<strong>HessianProxyFactoryBean</strong>改为了<strong>HttpInvokerProxyFactoryBean</strong>。</p>
<h2 id="u670D_u52A1_u7AEF_u6E90_u7801_u5206_u6790"><a href="#u670D_u52A1_u7AEF_u6E90_u7801_u5206_u6790" class="headerlink" title="服务端源码分析"></a>服务端源码分析</h2><p>　　在ServerConfig类的实现中，我们可以看到，最重要的莫过于类HttpInvokerServiceExporter。初始化该类时，我们传入了实现类的一个实例，并指定了对应的接口，与hessian的初始化类似。下面我们进入HttpInvokerServiceExporter源码（在spring-web包中），核心代码如下：<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">HttpInvokerServiceExporter</span> <span class="keyword">extends</span> <span class="title">RemoteInvocationSerializingExporter</span></span><br><span class="line">		<span class="keyword">implements</span> <span class="title">HttpRequestHandler</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">	<span class="annotation">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">handleRequest</span><span class="params">(HttpServletRequest request, HttpServletResponse response)</span></span><br><span class="line">			<span class="keyword">throws</span> ServletException, IOException </span>&#123;</span><br><span class="line">		<span class="keyword">try</span> &#123;</span><br><span class="line">			RemoteInvocation invocation = readRemoteInvocation(request);</span><br><span class="line">			RemoteInvocationResult result = invokeAndCreateResult(invocation, getProxy());</span><br><span class="line">			writeRemoteInvocationResult(request, response, result);</span><br><span class="line">		&#125;<span class="keyword">catch</span> (ClassNotFoundException ex) &#123;</span><br><span class="line">			<span class="keyword">throw</span> <span class="keyword">new</span> NestedServletException(<span class="string">"Class not found during deserialization"</span>, ex);</span><br><span class="line">		&#125;</span><br><span class="line">	&#125;</span><br><span class="line">	...</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>　　服务端处理客户端的请求主要包括三步：<br>　　1. 每次请求到达时调用方法handleRequest，最终都会将HttpServletRequest的inputStream解析成RemoteInvocation，该类封装了请求的方法名，方法参数类型和参数值。<br>　　2. 接着调用invokeAndCreateResult，该方法是在其父类RemoteInvocationSerializingExporter中实现的，关键代码如下。可以看到，最后实际是由DefaultRemoteInvocationExecutor完成的，执行RemoteInvocation中的方法并返回结果，并将结果封装成RemoteInvocationResult。<br>　　3. 最后将RemoteInvocationResult序列化，写入HttpServletResponse的输出流中<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">abstract</span> <span class="class"><span class="keyword">class</span> <span class="title">RemoteInvocationBasedExporter</span> <span class="keyword">extends</span> <span class="title">RemoteExporter</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">	<span class="keyword">private</span> RemoteInvocationExecutor remoteInvocationExecutor = <span class="keyword">new</span> DefaultRemoteInvocationExecutor();</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">protected</span> Object <span class="title">invoke</span><span class="params">(RemoteInvocation invocation, Object targetObject)</span></span><br><span class="line">			<span class="keyword">throws</span> NoSuchMethodException, IllegalAccessException, InvocationTargetException </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> remoteInvocationExecutor.invoke(invocation, targetObject);</span><br><span class="line">	&#125;</span><br><span class="line">	</span><br><span class="line">	<span class="function"><span class="keyword">protected</span> RemoteInvocationResult <span class="title">invokeAndCreateResult</span><span class="params">(RemoteInvocation invocation, Object targetObject)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">try</span> &#123;</span><br><span class="line">			Object value = invoke(invocation, targetObject);</span><br><span class="line">			<span class="keyword">return</span> <span class="keyword">new</span> RemoteInvocationResult(value);</span><br><span class="line">		&#125;</span><br><span class="line">		<span class="keyword">catch</span> (Throwable ex) &#123;</span><br><span class="line">			<span class="keyword">return</span> <span class="keyword">new</span> RemoteInvocationResult(ex);</span><br><span class="line">		&#125;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">DefaultRemoteInvocationExecutor</span> <span class="keyword">implements</span> <span class="title">RemoteInvocationExecutor</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">	<span class="annotation">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> Object <span class="title">invoke</span><span class="params">(RemoteInvocation invocation, Object targetObject)</span></span><br><span class="line">			<span class="keyword">throws</span> NoSuchMethodException, IllegalAccessException, InvocationTargetException</span>&#123;</span><br><span class="line">		<span class="keyword">return</span> invocation.invoke(targetObject);</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<h2 id="u5BA2_u6237_u7AEF_u6E90_u7801_u5206_u6790"><a href="#u5BA2_u6237_u7AEF_u6E90_u7801_u5206_u6790" class="headerlink" title="客户端源码分析"></a>客户端源码分析</h2><p>　　在客户端代码中，最重要的则为HttpInvokerProxyFactoryBean，具体的执行则是由其父类HttpInvokerClientInterceptor完成，关键代码如下：<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">HttpInvokerProxyFactoryBean</span> <span class="keyword">extends</span> <span class="title">HttpInvokerClientInterceptor</span> <span class="keyword">implements</span> <span class="title">FactoryBean</span>&lt;<span class="title">Object</span>&gt; </span>&#123;</span><br><span class="line"></span><br><span class="line">	<span class="keyword">private</span> Object serviceProxy;</span><br><span class="line"></span><br><span class="line">	<span class="annotation">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">afterPropertiesSet</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">super</span>.afterPropertiesSet();</span><br><span class="line">		<span class="keyword">if</span> (getServiceInterface() == <span class="keyword">null</span>) &#123;</span><br><span class="line">			<span class="keyword">throw</span> <span class="keyword">new</span> IllegalArgumentException(<span class="string">"Property 'serviceInterface' is required"</span>);</span><br><span class="line">		&#125;</span><br><span class="line">		<span class="keyword">this</span>.serviceProxy = <span class="keyword">new</span> ProxyFactory(getServiceInterface(), <span class="keyword">this</span>).getProxy(getBeanClassLoader());</span><br><span class="line">	&#125;</span><br><span class="line">	......</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">HttpInvokerClientInterceptor</span> <span class="keyword">extends</span> <span class="title">RemoteInvocationBasedAccessor</span></span><br><span class="line">		<span class="keyword">implements</span> <span class="title">MethodInterceptor</span>, <span class="title">HttpInvokerClientConfiguration</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">	<span class="keyword">private</span> String codebaseUrl;</span><br><span class="line"></span><br><span class="line">	<span class="keyword">private</span> HttpInvokerRequestExecutor httpInvokerRequestExecutor;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setHttpInvokerRequestExecutor</span><span class="params">(HttpInvokerRequestExecutor httpInvokerRequestExecutor)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">this</span>.httpInvokerRequestExecutor = httpInvokerRequestExecutor;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> HttpInvokerRequestExecutor <span class="title">getHttpInvokerRequestExecutor</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">if</span> (<span class="keyword">this</span>.httpInvokerRequestExecutor == <span class="keyword">null</span>) &#123;</span><br><span class="line">			SimpleHttpInvokerRequestExecutor executor = <span class="keyword">new</span> SimpleHttpInvokerRequestExecutor();</span><br><span class="line">			executor.setBeanClassLoader(getBeanClassLoader());</span><br><span class="line">			<span class="keyword">this</span>.httpInvokerRequestExecutor = executor;</span><br><span class="line">		&#125;</span><br><span class="line">		<span class="keyword">return</span> <span class="keyword">this</span>.httpInvokerRequestExecutor;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="annotation">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">afterPropertiesSet</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">super</span>.afterPropertiesSet();</span><br><span class="line">		getHttpInvokerRequestExecutor();</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="annotation">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> Object <span class="title">invoke</span><span class="params">(MethodInvocation methodInvocation)</span> <span class="keyword">throws</span> Throwable </span>&#123;</span><br><span class="line">		RemoteInvocation invocation = createRemoteInvocation(methodInvocation);</span><br><span class="line">		RemoteInvocationResult result = executeRequest(invocation, methodInvocation);</span><br><span class="line">		<span class="keyword">return</span> recreateRemoteInvocationResult(result);</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">protected</span> RemoteInvocationResult <span class="title">executeRequest</span><span class="params">(</span><br><span class="line">			RemoteInvocation invocation, MethodInvocation originalInvocation)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> executeRequest(invocation);</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">protected</span> RemoteInvocationResult <span class="title">executeRequest</span><span class="params">(RemoteInvocation invocation)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> getHttpInvokerRequestExecutor().executeRequest(<span class="keyword">this</span>, invocation);</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>　　客户端的执行步骤主要包括：<br>　　1. 每次客户端发起请求时，实际会执行HttpInvokerClientInterceptor的invoke方法，该方法会先将请求封装成RemoteInvocation<br>　　2. 接着再执行executeRequest方法，实际上最后调用了SimpleHttpInvokerRequestExecutor的executeRequest方法。该类会将RemoteInvocation序列化，并发起网络请求，将序列化数据写入到输出流中<br>　　3. 网络请求完成后，将返回结果反序列化成RemoteInvocationResult，如果RemoteInvocationResult的exception属性不为空，则抛出错误，否则返回具体的值。</p>
<h2 id="u603B_u7ED3"><a href="#u603B_u7ED3" class="headerlink" title="总结"></a>总结</h2><p>　　到这里，我们就完成了全部的分析的过程。可以看到基本上与hessian一致。但是HttpInvoker的不足之处便是其序列化采用了JDK提供的方式，在数据量上偏大。示例代码下载：<a href="/code/http-invoker.zip">http-invoker.zip</a></p>
<h2 id="u53C2_u8003_u8D44_u6599"><a href="#u53C2_u8003_u8D44_u6599" class="headerlink" title="参考资料"></a>参考资料</h2><p><a href="http://blog.csdn.net/java2000_wl/article/details/7441212" target="_blank" rel="external">http://blog.csdn.net/java2000_wl/article/details/7441212</a></p>

      
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